Mozilla Firefox 2.0.0.9 was just released but when I looked at the about box my old portable FireFox already said 2.0.0.9.
I guess I don't need to update 
BTW, was'nt 3.0 around the corner already?
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You need to read and search the forums more. Yea, it probably was an auto-update, unless you downloaded Firefox Portable within the past few days, which it was still at 2.0.0.9. Firefox 3 may be released in Beta, but I don't think John will have time.
I guess it's wise to wait untill its out of beta indeed!